license: refactor license check to be agnostic of input

[msanft]

Context

We want to refactor the apply command to strictly separate the logic working with user interaction (to the cli package) and the "business logic", which is agnostic of wether it's called from the CLI (to the internal/constellation package) in preparation for the Terraform provider.

Proposed change(s)

• Refactor the license check to not consume a file handler by default and only check the license in it, regardless of where it comes from.
• Move all user-I/O code to a separate function in the constellation apply command in the CLI.

Additional info

• AB#3557
• Working Telemetry
• E2E Test

Checklist

• Add labels (e.g., for changelog category)
• Is PR title adequate for changelog?
• Link to Milestone

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[msanft]

New E2E Test

[thomasten]

Thanks :)

[github-actions]

Coverage report

Package	Old	New	Trend
cli/internal/cmd	58.60%	58.50%	↘️
internal/constellation	[no test files]	[no test files]	🚧
internal/license	83.30%	81.80%	↘️